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afaik she'll ignore it and keep spidering.
I was watching deepcrawl collect a lot of 301's (*) this month. She seems to add it into the back of the list and get back to it later.
Not sure if she'll try a 404 again though, until the next crawl that is.. but can't see it stopping her spidering the rest of the pages on your site..
(*) I think I mean 301? - standard re-direct for links to folders missing the trailing slash